Enum regex_syntax::ast::ErrorKind
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pub enum ErrorKind { CaptureLimitExceeded, ClassEscapeInvalid, ClassRangeInvalid, ClassRangeLiteral, ClassUnclosed, DecimalEmpty, DecimalInvalid, EscapeHexEmpty, EscapeHexInvalid, EscapeHexInvalidDigit, EscapeUnexpectedEof, EscapeUnrecognized, FlagDanglingNegation, FlagDuplicate { original: Span, }, FlagRepeatedNegation { original: Span, }, FlagUnexpectedEof, FlagUnrecognized, GroupNameDuplicate { original: Span, }, GroupNameEmpty, GroupNameInvalid, GroupNameUnexpectedEof, GroupUnclosed, GroupUnopened, NestLimitExceeded(u32), RepetitionCountInvalid, RepetitionCountUnclosed, RepetitionMissing, UnsupportedBackreference, UnsupportedLookAround, // some variants omitted }
The type of an error that occurred while building an AST.
Variants
CaptureLimitExceeded
The capturing group limit was exceeded.
Note that this represents a limit on the total number of capturing groups in a regex and not necessarily the number of nested capturing groups. That is, the nest limit can be low and it is still possible for this error to occur.
ClassEscapeInvalid
An invalid escape sequence was found in a character class set.
ClassRangeInvalid
An invalid character class range was found. An invalid range is any range where the start is greater than the end.
ClassRangeLiteral
An invalid range boundary was found in a character class. Range boundaries must be a single literal codepoint, but this error indicates that something else was found, such as a nested class.
ClassUnclosed
An opening [
was found with no corresponding closing ]
.
DecimalEmpty
An empty decimal number was given where one was expected.
DecimalInvalid
An invalid decimal number was given where one was expected.
EscapeHexEmpty
A bracketed hex literal was empty.
EscapeHexInvalid
A bracketed hex literal did not correspond to a Unicode scalar value.
EscapeHexInvalidDigit
An invalid hexadecimal digit was found.
EscapeUnexpectedEof
EOF was found before an escape sequence was completed.
EscapeUnrecognized
An unrecognized escape sequence.
FlagDanglingNegation
A dangling negation was used when setting flags, e.g., i-
.
FlagDuplicate
A flag was used twice, e.g., i-i
.
Fields of FlagDuplicate
original: Span | The position of the original flag. The error position points to the duplicate flag. |
FlagRepeatedNegation
The negation operator was used twice, e.g., -i-s
.
Fields of FlagRepeatedNegation
original: Span | The position of the original negation operator. The error position points to the duplicate negation operator. |
FlagUnexpectedEof
Expected a flag but got EOF, e.g., (?
.
FlagUnrecognized
Unrecognized flag, e.g., a
.
GroupNameDuplicate
A duplicate capture name was found.
Fields of GroupNameDuplicate
original: Span | The position of the initial occurrence of the capture name. The error position itself points to the duplicate occurrence. |
GroupNameEmpty
A capture group name is empty, e.g., (?P<>abc)
.
GroupNameInvalid
An invalid character was seen for a capture group name. This includes errors where the first character is a digit (even though subsequent characters are allowed to be digits).
GroupNameUnexpectedEof
A closing >
could not be found for a capture group name.
GroupUnclosed
An unclosed group, e.g., (ab
.
The span of this error corresponds to the unclosed parenthesis.
GroupUnopened
An unopened group, e.g., ab)
.
NestLimitExceeded(u32)
The nest limit was exceeded. The limit stored here is the limit configured in the parser.
RepetitionCountInvalid
The range provided in a counted repetition operator is invalid. The range is invalid if the start is greater than the end.
RepetitionCountUnclosed
An opening {
was found with no corresponding closing }
.
RepetitionMissing
A repetition operator was applied to a missing sub-expression. This
occurs, for example, in the regex consisting of just a *
or even
(?i)*
. It is, however, possible to create a repetition operating on
an empty sub-expression. For example, ()*
is still considered valid.
UnsupportedBackreference
When octal support is disabled, this error is produced when an octal escape is used. The octal escape is assumed to be an invocation of a backreference, which is the common case.
UnsupportedLookAround
When syntax similar to PCRE's look-around is used, this error is
returned. Some example syntaxes that are rejected include, but are
not necessarily limited to, (?=re)
, (?!re)
, (?<=re)
and
(?<!re)
. Note that all of these syntaxes are otherwise invalid; this
error is used to improve the user experience.
Trait Implementations
impl Clone for ErrorKind
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fn clone(&self) -> ErrorKind
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for ErrorKind
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fn fmt(&self, __arg_0: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl Eq for ErrorKind
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impl PartialEq for ErrorKind
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fn eq(&self, __arg_0: &ErrorKind) -> bool
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This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &ErrorKind) -> bool
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This method tests for !=
.